It seems there's a problem going around. People are having trouble commenting on blogs. If you are having this trouble, I'd like to share with you what I've done so far. Of course, if you are experiencing this and can't figure it out, feel free to contact me through my contact page and I'll do my best to help you out.
My first experience was I couldn't comment on my own blog posts. At first, I thought it was blogger and waited patiently. Then I started googling to try and find a solution.
The most common suggested solution was to clear your cookies and cache. I was using IE9, and this didn't work for me. But, give it a try. I then decided to switch browsers. I've been having trouble with IE locking up for a while now anyway. So, I switched to Google Chrome, and it's been smooth sailing since.
Then, a follower contacted me. He couldn't comment on my blog. After more research, I learned this may be a blogger issue. The suggested solution was to go to Settings - Comments - Switch from 'embedded below post' to either of the other two options. This seems to have corrected the issue.
I hope this post helps someone out there get back to commenting on their favorite blogs.